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Zinc nanostructures for oxygen scavenging.

S Calderon V1, B Gomes, P J Ferreira

  • 1University of Minho, Department of Physics, Campus of Azurém, 4800-058 Guimarães, Portugal. sandra.carvalho@fisica.uminho.pt.

Nanoscale
|April 12, 2017
PubMed
Summary

This study shows that humidity activates zinc (Zn) nanoparticles on carbon as oxygen scavengers. These moisture-activated nano-scavengers form a protective layer and are suitable for high humidity applications like food packaging.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Zinc (Zn) nanostructures on carbon substrates are investigated for oxygen scavenging.
  • Understanding their oxidation behavior is crucial for material utilization.
  • Surface passivation creates a Zn-ZnO core-shell structure, offering a protective layer.

Purpose of the Study:

  • To elucidate the oxidation of carbon-supported Zn nanostructures.
  • To investigate their potential as oxygen scavenging materials activated by relative humidity (RH).
  • To explore their suitability for high RH applications.

Main Methods:

  • Magnetron sputtering was used to produce Zn nano-islands on carbon substrates.
  • Oxidation rates were studied for nanoparticles ranging from 5 to 18 nm.

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  • The influence of high relative humidity on oxidation kinetics was examined.

    • Main Results:

    • Oxidation rate was independent of nanoparticle size and orientation.
    • Oxidation kinetics showed partial deviation from the Cabrera and Mott theory.
    • High relative humidity accelerated oxidation, forming ZnO and facilitating Zn consumption.

    Conclusions:

    • Moisture-activated Zn nanoparticles on carbon exhibit potential as oxygen scavengers.
    • The Zn-ZnO core-shell structure provides a self-assembled protective layer.
    • These materials are promising for applications requiring high RH environments, such as food packaging.